condition mean min max ZT0-3 9.242913333333334 0.62175 14.03425 ZT4-7 2.522505 2.522505 2.522505 ZT8-11 5.12043 5.12043 5.12043 ZT12-15 14.1099575 7.820665 20.399250000000002 ZT16-19 22.9702 22.9702 22.9702 ZT20-23 25.8461 25.8461 25.8461